Standard Global Accelerator (GA) instances connect users in acceleration regions to origin servers that are deployed in different regions. Standard GA instances provide acceleration services at Layer 4 (TCP and UDP protocols) and Layer 7 (HTTP and HTTPS protocols).
Overview of standard GA instances
Standard GA instances support multiple access modes and provide end-to-end acceleration services to improve the performance of applications that are used by a global audience.
Access modes
Standard GA instances allow you to accelerate access through an accelerated IP address or a CNAME. When a client connects to an accelerated IP address or CNAME, traffic is routed to the nearest access point of the Alibaba Cloud global transmission network.
Accelerated IP address
Elastic IP address (EIP): GA provides separate EIPs based on acceleration regions. Users in each acceleration region can connect to GA through region-specific EIPs.
Anycast EIP: Users in multiple regions can connect to GA through a static IP address.
CNAME
The domain name that you want to accelerate is mapped to the CNAME that is allocated by GA to accelerate access to the backend service.
Acceleration network
Standard GA instances connect users in different acceleration regions to origin servers that are deployed in different regions and accelerate content delivery at Layer 4 (TCP and UDP) and Layer 7 (HTTP and HTTPS).
After GA receives client requests, GA forwards the requests to the backend services based on the routing type of the listener to avoid network congestion and reduce latency and network jitters.
Origin server connection
The following network connections are supported when GA forwards client requests to endpoints:
Private network connection: This type of network connection is used for endpoints that are deployed on Alibaba Cloud. You can specify Elastic Compute Service (ECS) instances, elastic network interfaces (ENIs), Classic Load Balancer (CLB) instances, Application Load Balancer (ALB) instances, Network Load Balancer (NLB) instances, Object Storage Service (OSS) buckets, and vSwitches as endpoints. This prevents endpoints from being exposed to the Internet and ensures the security of network connections.
Internet connection: This type of network connection is used for endpoints that are deployed outside Alibaba Cloud, including endpoints that are deployed in data centers and endpoints that are not supported by Alibaba Cloud. You can specify custom IP addresses and custom domain names as endpoints. For example, you can specify the CNAME of Web Application Firewall (WAF) as the custom domain name. WAF detects and filters malicious requests based on the protection policies that you configure and forwards trusted requests to the origin server. This ensures the security of your services.
Accelerated IP address types of standard GA instances
To create a standard GA instance, you must select the type of accelerated IP address based on the access mode that is required by your business.
Item | EIP | Anycast EIP |
Access mode | The custom access mode is used. You must specify an acceleration area.
You can select acceleration areas and acceleration regions based on your business requirements. Global Accelerator allocates a separate EIP to each acceleration region. | The automatic access mode is used. You do not need to specify an acceleration area.
Global Accelerator allocates an Anycast EIP to multiple regions across the globe. Users can connect to the nearest access point of the Alibaba Cloud global transmission network by sending requests to the Anycast EIP. |
Supported access points | For more information about the acceleration areas and regions supported by Global Accelerator, see Acceleration areas and regions. | The acceleration service depends on the access points that are supported by Anycast EIP. You can use Anycast EIPs to accelerate content delivery for clients outside the Chinese mainland. To accelerate content delivery for clients in the Chinese mainland by using Anycast EIPs, you must specify China (Hong Kong) as the acceleration region. For more information, see the "Access point locations" section of the What is Anycast EIP? topic. |
Characteristics |
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For pay-as-you-go standard Global Accelerator instances, two accelerated IP addresses of the EIP type are allocated to each acceleration region. Both accelerated IP addresses can receive client traffic at the same time to ensure high availability of the acceleration area.
By default, you cannot use Anycast EIPs as accelerated IP addresses. To use Anycast EIPs as accelerated IP addresses, go to the Quota Center console, find the quota named GA supports anycast, and then click Apply in the Actions column. For more information, see the "Adjust quotas" section of the Manage GA quotas topic.
To use Anycast EIPs, the Global Accelerator instances and the basic bandwidth plans must meet the following requirements:
Global Accelerator instances: Subscription standard Global Accelerator instances whose specifications are Large Ⅰ or higher and whose bandwidth metering method is pay-by-bandwidth.
Basic bandwidth plans: You must select the premium bandwidth type and the pay-by-data-transfer metering method. By default, pay-as-you-go basic bandwidth plans are unavailable. To use pay-as-you-go basic bandwidth plans, contact your account manager.
Specifications of standard GA instances
Standard GA instances are available in multiple specifications. Different instance specifications provide different acceleration capabilities. The following table describes the acceleration capabilities of each instance specification.
You can configure instance specifications only for subscription standard Global Accelerator instances.
By default, GA instances whose specifications are Large III or higher are not available. To use the GA instances, contact your account manager.
Specification | Number of acceleration regions | Maximum bandwidth | Maximum number of concurrent connections |
Small Ⅰ | 1 | 20 Mbps | 5,000 |
Small Ⅱ | 2 | 40 Mbps | 10,000 |
Small Ⅲ | 3 | 60 Mbps | 15,000 |
Medium Ⅰ | 5 | 100 Mbps | 25,000 |
Medium Ⅱ | 8 | 160 Mbps | 40,000 |
Medium Ⅲ | 10 | 200 Mbps | 50,000 |
Large Ⅰ | All regions For more information about the supported acceleration areas and regions, see Overview of acceleration areas. | 400 Mbps | 100,000 |
Large Ⅱ | 600 Mbps | 150,000 | |
Large Ⅲ | 800 Mbps | 200,000 | |
Large Ⅳ | 1 Gbps | 250,000 | |
Large Ⅴ | 1.2 Gbps | 300,000 | |
Large Ⅵ | 1.4 Gbps | 350,000 | |
Large Ⅶ | 1.6 Gbps | 400,000 | |
Large Ⅷ | 1.8 Gbps | 450,000 | |
Super Large Ⅰ | 2 Gbps | 500,000 | |
Super Large Ⅱ | 4 Gbps | 1,000,000 |